The relationship between additional heads of the quadriceps femoris, the vasti muscles, and the patellar ligament

Figure 3

Scheme of Type III quadriceps femoris. (a) Type IIIA quadriceps femoris: 5: fifth head; 6: sixth head; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis. (b) Type IIIB quadriceps femoris: 5: fifth head; 6: sixth head; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis. (c) Type IIIC quadriceps femoris: 5: fifth head; 6: sixth head; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis. (d) Type IIID quadriceps femoris: 5: fifth head; 6: sixth head; 7: seventh head; 8: eighth head; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis.

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